The bolt multiplier was a feature presented in all games following Ratchet & Clank. It was earned after the game was beaten at least once and the player entered Challenge Mode. After the feature was available, for every enemy Ratchet defeated, the bolts earned were multiplied by a sequence of numbers, starting in 2 and ending in 20. In Ratchet & Clank: Size Matters and Secret Agent Clank; however, the bolt multiplier could only go up to 12. With this upgrade, it would make it easier for Ratchet to obtain the more upgraded forms of weapons or the different RYNOs. The more enemies Ratchet killed, the more the multiplier would go up, but dying or being hit, even if no taking damage (as while being equipped with the Shield Charger), would drop the multiplier down to 1.